Abstract Details
| Name: | Siddharth Kumar |
| Affiliation: | Indian Institute of Science, Bengaluru |
| Conference ID : | ASI2023_468 |
| Title : | Are magnetic fields shaping these cometary globules or vice-versa? Cases of L328, L323, L331 clouds |
| Authors : | Siddharth Kumar, Department of Physics, Indian Institute of Science, Bangalore 560012, India Archana Soam, Indian Institute of Astrophysics, II Block, Koramangala, Bengaluru 560034, India Nirupam Roy, Department of Physics, Indian Institute of Science, Bangalore 560012, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, ISM and Galaxy |
| Abstract : | In this work, we present the R-band polarization observations of three isolated cometary globules namely LDN 323, LDN 328, LDN 331 with interesting head-tail morphology to study the magnetic field geometry of the clouds in context of the direction of ionizing radiation. R-band polarization observations were complemented by ?????? sky survey to study the large scale morphology of the magnetic fields in the region. The foreground contribution to the observed polarization values were subtracted by making polarimetric observations of stars that are located in the direction of the cloud and with known distances from Gaia measurements. A polarization map representing the geometry of the magnetic field in the cometary globule complexes was produced. More analysis such as distribution of polarization position angles in different regions and variation of polarization properties with distance of the background stars, were performed. Magnitude of plane of the sky magnetic field was calculated using structure-function analysis employing a modified Davis-Chadrashekar-Fermi formula. For studying the correlation between cloud morphology and magnetic field morphology a modified version of HRO (Histogram of Relative Orientation) analysis was employed. |